TW201445562A - Storage array module and its hard disk driver containing element - Google Patents

Abstract

A storage array module and its hard disk containing element are provided. The hard disk driver containing element includes a fixing recess, a first tray and a second tray. The first tray is reciprocally slidable in the fixing recess. The second tray is reciprocally slidable on the first tray. When the second tray slides a distance in a sliding direction of the first tray, the second tray pushes the first tray into the fixing recess, when the second tray reversely slides the distance along the sliding direction of the first tray, the second tray pushes the first tray outwards from the fixing recess.

Description

Storage array module and hard disk receiving unit thereof

The invention relates to a storage array module and a hard disk receiving unit thereof.

Existing server devices are often equipped with multiple data accessors with removable features, such as hard disk drives, to extend or enhance the functionality of the computer.

The type of the data access device disposed in the casing of the server device can be divided into various types, for example, the data access device is directly locked in the carrier by screws, or the rail is first screwed to the rail. Both sides of the data accessor, then slide into the carrier and finally secure the data accessor via screws or other fixing elements.

However, in the above method, when installing and removing the data accessor, it is necessary to tighten or loosen a large number of screws, which is cumbersome and inconvenient to operate.

One aspect of the present invention provides a storage array module and a hard disk storage unit for solving the difficulties mentioned in the prior art.

According to an embodiment of the invention, the hard disk receiving unit comprises a fixing slot, a first tray, two limiting portions, a second tray and two pushing portions. The first tray is slidably disposed in the fixing groove. The two limit parts are spaced apart Configured on the first tray. An imaginary connection between the two limiting portions is parallel to one of the first trays sliding axially. The second tray is slidably supported on the first tray for carrying a hard disk. The two pushing portions are disposed on the second tray at intervals, and are all passed by the imaginary connection. When the second tray slides a distance along the sliding axis, one of the pushing portions starts to push one of the limiting portions, and the first tray is finally pushed into the fixing groove. When the second tray protrudes from the fixing groove and slides the same distance, the other pushing portion starts to push the other limiting portion, and the first tray is finally pulled out of the fixing groove.

According to one or more embodiments of the present invention, the second tray further includes a linear opening, and the opposite inner edges of the linear opening are respectively the pushing portions. The limiting portions are respectively a protruding post connecting the first bearing surface of the first tray and passing through the linear opening.

According to one or more embodiments of the present invention, the second tray further includes a linear opening, and the two opposite inner edges of the linear opening are respectively pushing portions. The first tray further includes a linear flange that connects one of the first bearing surfaces of the first tray and passes through the linear opening. The opposite ends of the two ends of the linear flange are respectively the two limiting portions.

According to one or more embodiments of the present invention, the first tray further includes a first bearing surface, a side wall and a linear gap. The first bearing surface supports the second tray. The side wall abuts the bearing surface. The line notch is located on the side wall. The two inner edges of the linear notch are respectively the two limiting portions. The second tray further includes a second bearing surface and an extension wing. The second bearing surface supports the hard disk. The extension wing extends from the second bearing surface to the side wall of the first tray and slidably engages the gap. The opposite outer edges of the extension wings are respectively two pushing portions.

According to one or more embodiments of the present invention, the second tray further includes a plurality of linear ridges that are parallel to each other and physically contact the hard disk.

According to one or more embodiments of the present invention, the second tray further includes a disc body, a handle portion, a tab portion, an operating portion and a spring member. The handle portion is located at one end of the disc body and is located outside the fixing slot and has an internal space. The tab is located in the inner space and partially protrudes from one of the surfaces of the handle portion. The operating portion is located in the inner space, connects the tongue portion, and partially protrudes from the other surface of the handle portion. The spring element is located in the inner space and connects the tab and the handle.

According to one or more embodiments of the present invention, one of the inner walls of the fixing groove further has a locking notch. When the first tray slides into the fixing slot, the tab is fastened in the locking slot.

According to one or more embodiments of the present invention, the second tray further includes at least one stopper, and the stopper is located at the other end of the disc body opposite to the handle portion. When the second tray protrudes from the fixing slot, the stopper disengages the hard disk from one of the connectors in the casing.

According to one or more embodiments of the present invention, the first tray further includes a first stopping portion, and the fixing groove includes a second stopping portion. By blocking the first stop by the second stop, the first tray cannot be completely detached from the fixing groove.

According to an embodiment of the invention, the storage array module comprises a casing, a plurality of hard disks and a plurality of hard disk receiving units as described above. The housing has a plurality of first interfaces. Each hard disk is placed on the first tray and the second tray, and has a second interface that is pluggably coupled to one of the first interfaces. When each hard After the second tray of the disc accommodating unit slides a distance along the sliding axial direction, one of the pushing portions starts to push the first tray, so that the first tray is finally pulled out of the fixing slot, when the first tray is the first of the hard disk accommodating units Before the tray is pushed, its first interface has been separated from the corresponding second interface.

In summary, due to the design of the hard disk accommodating unit of the present invention, when the user removes or replaces the hard disk therein, the user can directly remove it with one hand without removing any screws. Or the purpose of replacing the hard drive.

100‧‧‧Server device

110‧‧‧Chassis

110U‧‧‧Upper area

110G‧‧‧space

111‧‧‧First interface

200‧‧‧Storage Array Module

210‧‧‧Shell

211‧‧‧ accommodating space

220‧‧‧hard disk unit

221‧‧‧ Hard disk

222‧‧‧second interface

230, 230A, 230B, 230C‧‧‧ hard disk storage unit

231‧‧‧Shell

232‧‧‧ card slot

233‧‧‧fixed slot

234‧‧‧Second stop

240‧‧‧First tray

241‧‧‧floor

242‧‧‧First bearing surface

243‧‧‧ side wall

244‧‧‧Limited

245A‧‧‧first stud

245B‧‧‧second stud

246‧‧‧Line flange

247‧‧‧Line gap

250‧‧‧Second tray

251‧‧‧ dish

252‧‧‧Second bearing surface

253‧‧ ‧block

254‧‧‧First stop

255‧‧‧Promotion Department

256‧‧‧Line opening

256A‧‧‧first inner edge

256B‧‧‧second inner edge

257‧‧‧Extended wing

258‧‧‧Line type ridge

260‧‧‧Hands

261‧‧‧Internal space

262, 263‧‧‧ surface

270‧‧‧Kegu unit

271‧‧‧Card

272‧‧‧Operation Department

273‧‧‧Spring elements

D1‧‧‧First distance

D2‧‧‧Second distance

L‧‧‧Imaginary connection

S‧‧‧Sliding axial

S1‧‧‧Slide in direction

S2‧‧‧Sliding direction

FIG. 1 is a schematic diagram of a storage array module according to an embodiment of the present invention incorporated in a server device.

FIG. 2A is a schematic view showing the hard disk accommodating unit according to an embodiment of the present invention in a first pulled-out state.

FIG. 2B is a schematic diagram showing the hard disk accommodating unit of FIG. 2A in a second pulled-out state.

FIG. 2C is a schematic diagram showing the hard disk accommodating unit of FIG. 2A in a retracted state.

FIG. 2D is a schematic diagram showing the hard disk accommodating unit of FIG. 2A in a third pulled-out state.

FIG. 3A to FIG. 3B are schematic diagrams showing the flow of a hard disk taken out from the hard disk receiving unit.

FIG. 4A is a perspective view of a hard disk accommodating unit according to another embodiment of the present invention.

FIG. 4B is a diagram showing a hard disk accommodating unit according to still another embodiment of the present invention. A three-dimensional diagram.

FIG. 5 is a perspective view of a hard disk accommodating unit according to still another embodiment of the present invention.

FIG. 6 is a simplified schematic diagram of a fastening unit of a hard disk accommodating unit according to still another embodiment of the present invention.

The embodiments of the present invention are disclosed in the following drawings, and the details of However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

FIG. 1 is a schematic diagram of a storage array module 200 according to an embodiment of the present invention incorporated in a server device 100.

Referring to FIG. 1 , the storage array module 200 of the present invention includes a casing 210 and a plurality of hard disk units 220 . The casing 210 has an accommodating space 211 and a plurality of first interfaces 111 (for example, a hard disk 221 connecting terminal). The first interface 111 is a toolless connection and is disposed in the accommodating space 211. The hard disk units 220 are arranged in a plurality of stacked states in the accommodating space 211, for example, in a generalized array arrangement, and are arranged in the accommodating space 211, that is, the row direction and the column of the array. The directions may or may not be orthogonal to each other. Each hard disk unit 220 includes a hard disk accommodating unit 230 and a hard disk 221 . Each hard disk accommodating unit 230 accommodates only a single hard disk 221 (HDD). Each hard disk 221 has a second interface 222 (for example, the hard disk 221 is connected to the terminal). The second interface 222 is a toolless connection connector that is pluggably coupled to one of the first interfaces 111. Since the hard disk 221 is the most common hard disk product, meaning that the hard disk external box is not used, the hard disk 221 can also be understood as a "naked disk".

FIG. 2A is a schematic diagram of the hard disk accommodating unit 230 according to an embodiment of the present invention in a first pulled state.

Referring to FIG. 1 and FIG. 2A , each hard disk accommodating unit 230 includes a casing 231 , a first tray 240 and a second tray 250 . The housing 231 includes a fixing groove 233 therein. The housing 231 is fixed (for example, locked) in the accommodating space 211 of the casing 210 (FIG. 1). The first tray 240 is slidably disposed in the fixing groove 233. Therefore, the first tray 240 can slide back or slide out of the fixing groove 233 in a sliding axial direction S. Two limiting portions 244 are disposed on the first tray 240 at intervals. The imaginary line L between the two stopper portions 244 slides in parallel with the axial direction S. The second tray 250 is slidably supported on the first tray 240 so that the second tray 250 can slide back and forth along the sliding axis S on the first tray 240. Two pushing portions 255 are disposed on the second tray 250 at intervals. The two pushing portions 255 are all located on the imaginary connecting line L, that is, the imaginary connecting line L passes through the two pushing portions 255 at the same time. Each hard disk 221 physically contacts the second tray 250, but can be placed on the first tray 240 and the second tray 250 at the same time.

In this embodiment, the storage array module 200 is coupled to a server device 100, for example, slidably disposed in a chassis 110 of the server device 100 so as to be pushed into the chassis 110 or pulled out of the chassis 110; In a more detailed description, the storage array module 200 is slidably disposed in the chassis. One of the upper layer areas 110U; or the number of the storage array modules 200 may be two, and a space 110G is maintained between each other.

However, the storage array module 200 of the present invention is not limited to being applied only to the server device 100.

FIG. 2B is a schematic diagram showing the hard disk accommodating unit 230 of FIG. 2A in a second pulled-out state. FIG. 2C is a schematic diagram showing the hard disk accommodating unit 230 of FIG. 2A in a retracted state.

Referring to FIGS. 2A and 2B , the first tray 240 includes a bottom plate 241 and two side walls 243 . The two side walls 243 are located on opposite sides of the bottom plate 241 and extend in the same direction (eg, upward). . The bottom plate 241 has a first protrusion 245A, a second protrusion 245B and a first bearing surface 242. The first bearing surface 242 can support the second tray 250 and the hard disk 221 (Fig. 1). The first protrusion 245A and the second protrusion 245B are disposed on the first bearing surface 242, and are respectively regarded as the second limiting portion 244. The first stud 245A and the second stud 245B are, for example, rivets, screws or the like, respectively.

The second tray 250 includes a tray 251 and at least one linear opening 256. The disk body 251 has a second bearing surface 252. The second bearing surface 252 is used to support and physically contact the hard disk. The linear opening 256 is defined on the second bearing surface 252 of the disk 251, and the opposite inner edges of the linear opening 256 (hereinafter referred to as the first inner edge 256A and the second inner edge 256B) are respectively the pushing portions 255. One end of the first stud 245A and the second stud 245B are connected to the first carrying surface 242 of the first tray 240, and the other end is passed through the linear opening 256. For example, in FIG. 2A, the first stud 245A and the first The two studs 245B are, for example The circular rivet, after the other end protrudes from the linear opening 256, is further covered on the second bearing surface 252.

The first pulled-out state of FIG. 2A is a state in which the second tray 250 is pulled out from the first tray 240 by a maximum amplitude, and the first inner edge 256A of the linear opening 256 contacts the first stud 245A. The second tray 250 further includes a handle portion 260. The handle portion 260 is located at one end of the disk body 251 away from the first inner edge 256A and is always located outside the fixing groove 233 so that the user pulls the second tray 250 out of the fixing groove 233 by the handle portion 260.

It should be understood that the first protrusion 245A and the second protrusion 245B of the first tray 240 and the linear opening 256 of the second tray 250 are not limited to the first bearing surface 242 and the second bearing surface 252, and may be configured. The first tray 240 and the other adjacent side walls of the second tray 250. In addition, the sliding manner of the first tray 240 or the second tray 250 is not limited to the technical means, such as sliding by rails, pulleys, sliders or simply by the tray itself.

Thus, when the second tray 250 of FIG. 2A slides a first distance D1 along the sliding direction S1 of the sliding axis S, the first distance D1 is the distance from the first inner edge 256A to the first protrusion 245A, and the second The tray 250 is entirely located on the first carrying surface 242 of the first tray 240, and the second inner edge 256B of the linear opening 256 begins to contact the second stud 245B (Fig. 2B), so it is referred to as the second pulled out state. Then, in the second pull-out state, the second boss 245B is pushed by the second inner edge 256B to slide the first tray 240 in the sliding direction S1 of the sliding axis S, so that the second tray 250 and the first tray 240 Finally, it is pushed into the fixing groove 233 (Fig. 2C), so it is called the retracted state.

2D is a diagram showing the hard disk accommodating unit 230 of FIG. 2A A schematic diagram of the three pull out state.

On the other hand, referring to FIG. 2C and FIG. 2D, when the second tray 250 in FIG. 2C slides a second distance D2 toward the sliding direction S2 of the sliding axis S, the second inner edge 256B of the linear opening 256 is caused. Starting to contact the second protrusion 245B (Fig. 2D), the second distance D2 is the distance from the second inner edge 256B to the second protrusion 245B, which is the same as the first distance D1. Therefore, the state at this time is called the third pull-out. status. Then, in the third pull-out state, the first post 245A is pushed by the first inner edge 256A to slide the first tray 240 in the sliding direction S2 of the sliding axis S, so that the second tray 250 and the first tray 240 Finally, it is pulled out of the fixing groove 233 (Fig. 2A), and returns to the first pulled state.

Thus, when the hard disk 221 (FIG. 1) is laid flat on the second carrying surface 252 of the second tray 250, and the hard disk receiving unit 230 is retracted from the first pulled state through the second pull-out state. In the state, the second interface 222 of the hard disk 221 can thus be inserted into the first interface 111 to accept the exchange of information and the supply of power.

3A to 3B are schematic diagrams showing the flow of a hard disk 221 taken out from the hard disk accommodating unit 230.

On the other hand, when the hard disk accommodating unit 230 is operated to the above-described first pull-out state (FIG. 3B) by the retracted state through the above-described third pull-out state (FIG. 3A), since the hard disk 221 is The second interface 222 has left the first interface 111 (Fig. 1), and the hard disk 221 has not been fixed by other structures. Therefore, the user can pick up the hard disk 221 with one hand for the purpose of removing or replacing the hard disk 221.

However, the limiting portion of the first tray 240 and the pushing portion of the second tray 250 are not limited to the above design, and the limiting portion of the first tray 240 and the pushing portion of the second tray 250 may be changed and utilized as follows.

FIG. 4A is a perspective view of a hard disk accommodating unit 230A according to another embodiment of the present invention.

In another embodiment, as shown in FIG. 4A, the structure of the second tray 250 is the same as that of FIG. 2A, and the description thereof is the same as above, and thus will not be described again. However, the first tray 240 further includes a linear flange 246 which is embossed on the first bearing surface 242 of the first tray 240 and extends into the linear opening 256 from the first bearing surface 242 of the first tray 240. Therefore, the opposite ends of the linear flanges 246 can respectively become the above-mentioned limiting portions 244, and the opposite inner edges of the linear openings 256 are respectively the pushing portions 255.

However, the linear flange 246 of the first tray 240 and the linear opening 256 of the second tray 250 are not limited to the first bearing surface 242 and the second bearing surface 252, and may be disposed on the first tray 240 and the second tray. Other adjacent sidewalls of 250.

FIG. 4B is a perspective view of the hard disk accommodating unit 230B according to still another embodiment of the present invention.

As shown in FIG. 4B, the structure of the first tray 240 is the same as that of the second embodiment. The difference is that the first tray 240 further includes a linear notch 247, and the linear notch 247 is located on the side wall 243. The structure of the second tray 250 is the same as that of FIG. 2A, with the difference that the second tray further includes an extension wing 257. The extension wing 257 extends from the second bearing surface 252 of the disk 251 toward the side wall 243 of the first tray 240 and slidably engages the line notch 247. Therefore, the extension wing 257 The two opposite outer edges can respectively become the pushing portion 255, and the opposite inner edges of the linear notches 247 are respectively the limiting portions 244.

However, the linear notch 247 of the first tray 240 and the extension wing 257 of the second tray 250 are not limited to be disposed only on the side wall 243, and may be disposed on the first bearing surface 242.

FIG. 5 is a perspective view of a hard disk accommodating unit 230C according to still another embodiment of the present invention.

As shown in FIGS. 1 and 5, the second tray 250 further includes a second stopper 253 which is located at the other end of the disc body 251 opposite the handle portion 260 and projects upward. Thus, when the hard disk accommodating unit 230C is operated from the retracted state to the third pulled-out state described above (FIG. 3A), that is, before the first tray 240 of the hard disk accommodating unit 230C starts being pushed, The first tray 240 drives the stoppers 253 to push the hard disk 221 (FIG. 1). Referring to FIG. 1, the second interface 222 of the hard disk 221 is forced out of the first interface 111 to avoid the second interface of the hard disk 221. The connection 222 is too tightly connected to the first interface 111 to extend beyond the fixing slot 233 with the second tray 250.

As shown in FIG. 2A, the second tray 250 further includes a plurality of linear ridges 258. The linear ridges 258 are located parallel to each other on the second bearing surface 252 for physically contacting and supporting the hard disk. In addition, the linear ridges 258 are in line contact with the hard disk to reduce the friction between the hard disk and the second tray 250.

FIG. 6 is a simplified schematic diagram of the fastening unit 270 of the hard disk accommodating unit 230 according to still another embodiment of the present invention.

As shown in FIGS. 2C and 6 , the second tray 250 has a fastening unit 270 . The fastening unit 270 includes a latching portion 271, an operating portion 272, and A spring element 273. The tab portion 271 is located in an interior space 261 of the handle portion 260 and partially extends from a surface 262 of the handle portion 260. The operating portion 272 is located in the internal space 261, connects the tab portion 271, and partially protrudes from the other surface 263 of the handle portion 260. The spring member 273 is located in the internal space 261 and connects the tab portion 271 and the handle portion 260. When the tab portion 271 and the operating portion 272 are pushed to press the spring member 273, the spring member 273 generates compression; after the tongue portion 271 and the operating portion 272 finish pressing the spring member 273, the spring member 273 operates the tab portion 271 Portion 272 returns to its original position.

Thus, when the hard disk accommodating unit 230 enters the retracted state, the latching portion 271 is pushed to protrude into the securing notch 232 of the inner wall of the fixing groove 233, so that the latching portion 271 is locked to the locking notch. 232 (FIG. 2C), further restricting the second tray 250 from being freely slidable by the fixing groove 233; otherwise, when the operating portion 272 is pushed so that the tab portion 271 is retracted into the internal space 261, and the tab portion 271 is released from the hook After the notch 232, the second tray 250 can be freely slid by the fixing groove 233 (Fig. 2A).

In addition, referring to FIG. 2A, the first tray 240 is disposed in the fixing slot 233, so that the first tray 240 cannot be completely separated from the fixing slot 233. For example, the first tray 240 further includes two first stopping portions. 254, each first stop portion 254 is, for example, a cylinder at the end of the first tray 240. The fixing groove 233 has two second stopping portions 243 therein, and each of the second stopping portions 243 is, for example, a cylinder projecting downward from the upper surface of the inner wall and located in the movement stroke of the first stopping portion 254. As such, the first stopper 240 is blocked by the second stopper portion 243, and the first tray 240 cannot be completely separated from the fixing groove 233.

Finally, in the various embodiments disclosed above, it is not intended to limit the present invention. The invention can be practiced in the present invention without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

230‧‧‧hard disk storage unit

231‧‧‧Shell

232‧‧‧ card slot

233‧‧‧fixed slot

234‧‧‧Second stop

240‧‧‧First tray

241‧‧‧floor

242‧‧‧First bearing surface

243‧‧‧ side wall

244‧‧‧Limited

245A‧‧‧first stud

245B‧‧‧second stud

250‧‧‧Second tray

251‧‧‧ dish

252‧‧‧Second bearing surface

254‧‧‧First stop

255‧‧‧Promotion Department

256‧‧‧Line opening

256A‧‧‧first inner edge

256B‧‧‧second inner edge

258‧‧‧Line type ridge

260‧‧‧Hands

D1‧‧‧First distance

L‧‧‧Imaginary connection

S‧‧‧Sliding axial

S1‧‧‧Slide in direction

S2‧‧‧Sliding direction

Claims (11)

A hard disk accommodating unit includes: a fixing slot; a first tray that is slidably disposed in the fixing slot; and two limiting portions are disposed on the first tray at intervals, and the two limiting portions are An imaginary connection is parallel to the sliding direction of one of the first trays; a second tray is slidably supported on the first tray for carrying a hard disk; and two pushing portions are disposed at intervals On the second tray, the two pushing portions are all passed by the imaginary connection, wherein when the second tray slides a distance along the sliding axis, the pushing portion starts to push the limiting portion, so that the first The tray is pushed into the fixing slot. When the second tray protrudes from the fixing slot and slides the distance, the other pushing portion starts to push the other limiting portion, so that the first tray is pulled out of the fixing slot. . The hard disk accommodating unit of claim 1, wherein the second tray further comprises a linear opening, and the two opposite inner edges of the linear opening are respectively the two pushing portions, and the two limiting portions are respectively a protruding column Connecting one of the first carrying surfaces of the first tray and passing through the linear opening. The hard disk accommodating unit of claim 1, wherein the second tray is further The first tray further includes a linear flange connected to the first bearing surface of the first tray, and the first tray further comprises a second pushing portion. The linear opening is formed, wherein the opposite ends of the linear flange are respectively the two limiting portions. The hard disk accommodating unit of claim 1, wherein the first tray further comprises: a first bearing surface supporting the second tray; a side wall adjacent to the bearing surface; and a linear gap on the side wall The second inner edge of the linear notch is the second limiting portion. The hard disk accommodating unit of claim 4, wherein the second tray further comprises: a second carrying surface supporting the hard disk; and an extending wing extending from the second carrying surface toward the first tray The side wall is slidably engaged with the linear notch, wherein the two opposite outer edges of the extending wing are the two pushing portions respectively. The hard disk accommodating unit of claim 1, wherein the second tray further comprises a plurality of linear ridges that are parallel to each other and physically contact the hard disk. The hard disk accommodating unit of claim 1, wherein the second tray further comprises: a disk body; a handle portion located at one end of the disk body and located outside the fixing groove, having an internal space; a latching portion located in the inner space and partially extending from a surface of the handle portion; an operating portion located in the inner space, connecting the tab portion and partially extending the other surface of the handle portion And a spring element located in the inner space connecting the tab portion and the handle portion. The hard disk accommodating unit of claim 7, wherein an inner wall of the fixing slot further has a locking slot, and the latch is fastened when the first tray slides into the fixing slot. Inside the card slot. The hard disk accommodating unit of claim 7, wherein the second tray further comprises at least one stopper located at the other end of the disk opposite the handle portion, wherein the second tray extends After the fixing groove, the stopper causes the hard disk to be disconnected from one of the connectors in the casing. The hard disk accommodating unit of claim 1, wherein the first tray further comprises a first stopping portion, wherein the fixing groove has a second stopping portion, wherein the second stopping portion blocks the The first stopping portion cannot completely disengage the fixing groove. A storage array module includes: a casing having a plurality of first interfaces; a plurality of hard disk receiving units, each of the hard disk receiving units comprising: a fixing slot fixed in the casing; a first tray is slidably disposed in the fixing slot; a second tray is slidably supported on the first tray; and two pushing portions are disposed on the second tray at intervals An imaginary connection between the portions is parallel to a sliding axial direction of the first tray; and a plurality of hard disks, each hard disk is placed on the first tray and the second tray, and has a second interface pluggable One of the first interfaces is coupled to the first interface, wherein when the second tray of each of the hard disk receiving units slides a distance along the sliding axis, one of the two pushing portions starts to push the first a tray such that the first tray is pulled out of the fixing slot, and one of the first interfaces has been disengaged from the corresponding second interface before the first tray of each of the hard disk receiving units starts to be pushed .